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Default need help summing product of two arrays

Can anyone show me a formula to sum a product of two arrays only when there
is a match. Suppose I want to add up the product of A and C for Apple
(answer 3%) and Orange (answer 3.5%)

eg.
A B C
1% Apple 100%
2% Orange 50%
3% Pear 25%
4% Apple 50%
5% Orange 50%


 
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